How Many Batteries for a 1000-watt Inverter

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A 1000-watt inverter can power a wide range of electronic devices and appliances, depending on their power requirements. However, an inverter requires a battery to function, and the size of the battery depends on what appliance you need to run and how long you need to run it. 

In this article, we will discuss how to determine the battery size required for a 1000-watt inverter. We will explore the factors that need to be considered, such as the battery voltage and capacity, and provide an example illustrating the process.

What Can You Run off a 1000-watt Inverter?

As stated before a 1000-watt inverter can run a wide range of appliances.  The actual continuous output of a 1000-watt inverter will be somewhere around 900 watts. This is because of the efficiency losses from converting DC power to AC power and losses through the wiring. 

So a 1000-watt inverter will support appliances rated less than 900 watts. 

This includes:

Small appliances: A 1000-watt inverter can power small appliances such as 400-watt blenders, 500-watt coffee makers, and a 900-watt toaster. 

Home electronics: A 1000-watt inverter can power electronics such as laptops, TVs, and gaming consoles.

Power tools: A 1000-watt inverter can power tools such as drills, saws, and sanders.

Heating and cooling appliances: A 1000-watt inverter can power small heating and cooling appliances such as fans and space heaters.

Lighting: A 1000-watt inverter can power a number of light bulbs, both LED and incandescent.

What Battery Size for a 1000-watt Inverter

To keep your system running as efficiently and reliably as possible, it’s important to use the right size battery. Inverters come with an input amperage rating that gives you an idea of the amount of power it can handle. The larger this number is, the more power it can provide to power your devices.

To calculate the number of batteries required we first need to determine the number of amps the Inverter will draw and then determine the number of amp hours. 

How many amps for a 1000-watt Inverter

To calculate the number of amps the inverter will draw you divide the watt rating by the voltage. 

For a 12v system, you’ll need 

1000/12 = 83.33 Amps 

A 12-volt system should have a battery that can safely provide up to 83.33 amps of current. 

For a 24v Inverter, you’ll need 

1000/24 = 41.67 Amps

A 24-volt system should have a battery capable of providing up to 41.67 amps of current per hour. 

In the case of a 1000-watt inverter, it is best to go for a 24-volt system as it will need fewer amps. Fewer amps will need smaller wire gauges, reducing system losses and fire hazards. 

How many Amp-hours for a 1000-watt Inverter

So drawing 83 amps at 12v you’ll need around 400Ah or two 200Ah batteries and for a 24v battery bank, you’ll need a 24 200Ah battery or two 100Ah Batteries wired in series.  

However, you can use a single 100Ah 12v battery in case you’ll not be drawing all the power from the battery all at once. 

For example, if you run a 700-watt pressure cooker for some 20 minutes you will only need around 20 amps from the battery. 

Depending on the Wattage of the appliance and the amount of time you need to run the appliance. This will determine the Amp-hours needed. 

A lithium battery can allow a discharge of up to 50% of its capacity therefore a 24v 100Ah battery with a 2400-watt-hour capacity will be ideal for a 1000-watt inverter when running small appliances over short periods of time. 


A 1000-watt inverter can power multiple devices but the key determinant is the battery. An ideal battery for a 1000-watt inverter is a 24v 200Ah battery or two 100Ah 12v batteries wired in series. This is enough to last up to 5 hours with a continuous discharge of 900 watts.

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